Update mta-sts.mdx

[cf-scott]

The template mentioned in the doc no longer exists.

Summary

The mta-sts template was very basic, and can easily be replicated by modifying the Hello World template.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated the MTA-STS documentation to reflect the removal of the MTA-STS template and provide instructions for using the Hello World template instead.

• Removed reference to the non-existent MTA-STS template.
• Updated instructions to use the Hello World template for MTA-STS setup.
• Provided sample worker code for fetching the MTA-STS policy file.

Modified Files

• src/content/docs/email-routing/setup/mta-sts.mdx

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